The author's defence against a charge that he plagiarized Dr. Bryan Higgins' experiments. It includes the correspondence with his accusers, Dr. Higgins and Dr. Richard Brocklesby, between Nov. 30 and Dec. 9, 1775
"Errata": p. 
"A catalogue of books written by Joseph Priestley ... and printed for J. Johnson": p. [89-92]. P.  also includes statement: "On the 30th of December will be published... The Second Volume of Experiments and Observations on different Kinds of Air ..."
John Adams Library copy has bookplate: John Adams Library, in the Custody of the Boston Public Library
Also available on microfilm
John Adams Library copy transferred from the supervisors of the Temple and School Fund. Quincy, Mass., 1894
John Adams Library copy bound with: Joseph Priestly. Experiments and observations relating to the various branches of natural philosophy... London : Printed for J. Johnson, 1781